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MA: Fachverband Magnetismus
MA 5: Spin Textures and magnetic Phase Transitions
MA 5.3: Vortrag
Montag, 7. März 2016, 10:30–10:45, H34
Skyrmionic phases and skyrmion lifetime in an ultrathin magnetic film — •Levente Rózsa1,2, Eszter Simon1, Krisztián Palotás1, László Udvardi1, and László Szunyogh1 — 1Budapest University of Technology and Economics, Budapest, Hungary — 2Wigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary
In ultrathin magnetic films, the Dzyaloshinsky-Moriya interaction (DMI) between local magnetic moments can lead to the formation of chiral spin structures like spin-spirals and magnetic skyrmions. Particularly interesting are magnetic phase transitions influenced by DMI. In this work we determined the magnetic B-T phase diagram of PdFe bilayer on Ir(111) surface by performing Monte Carlo and spin dynamics simulations based on an effective classical spin model. The parameters of the spin model were determined by ab initio methods. At low temperatures we found three types of ordered phases, while at higher temperatures, below the completely disordered paramagnetic phase, a large region of the phase diagram is associated with a fluctuation-disordered phase. Within the applied model, this state is characterized by the presence of skyrmions with finite lifetime. According to the simulations, this lifetime follows the Arrhenius law as a function of temperature [1].
[1] L. Rózsa, E. Simon, K. Palotás, L. Udvardi, L. Szunyogh arXiv:1510.04812 (2015)